3000 kg or 6600 lb. Water is very easy in the metric or SI system because the gram (1/1000 of kg) was originally defined as the mass (or weight on earth's surface) of 1 mL (1/1000 of a L). So a. 100 cubic decimetres is roughly 22 gallons. Each gallon takes up 231 cubic inches so 22 x 231 = 5082 cubic inches or 12909 cubic centimetres Within a day, i would say it's possible. Scientists have said that drinking 60 cups of water within an hour is enough to flood your system and kill you. Weight of any liquid depends upon its density, as for example if 1 liter of water weights 1 Kg. then 1 liter of oil will weight 1.75 Kg. This is because oil is more dense as compared to water. So. This question cannot be answered sensibly. A litre is a measure of volume, with dimensions [L3]. A pound is a measure of mass, with dimensions [M]. The two measure different things and basic. The weight of water is approximately 1 kilogram per liter. Therefore, 18.9 liters of water would weigh around 18.9 kilograms. 2.7 litres equal 11.41 cups or 2.85 quarts. 1 litre = 33.8140227 oz 750 litres x 33.8140227 = 25360.517025 oz 10 liters = 10 kg (22.05 lbs) of water, since water has a density of 1kg/L. 1.9 liters is equal to 8.03 us cups (1,9000 milliliters).